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Knotweed damage

What Is Japanese Knotweed?

Japanese Knotweed is the most invasive species in Britain and can have costly legal implications for those who have Knotweed on their commercial or residential property.

Where is Japanese Knotweed in the UK?

Knotweed dispersal
Image credit: NBN Atlas

Why is Japanese Knotweed a Problem?

Japanese knotwed damage

Japanese Knotweed exhibits vigorous growth through the soil from a fibrous rhizome (creeping root system) that can cause damage to areas of hard standing, foundations, drains, services, walls and other built structures by growing through cracks and openings between them. Soil can be contaminated with reproductive knotweed material up to a depth of 3m and a radius of over 7m.

The Environment Agency recommends the removal and/or treatment of all soil within these extents.

If it is not dealt with before a site is redeveloped, or if groundworks take place for another reason, Japanese knotweed contaminated material can very easily be spread across or off a site, resulting in new areas of knotweed growth and, potentially, criminal prosecution or litigation from third parties.

This is because from only a small amount (less than a centimetre) of knotweed root (rhizome), regeneration can occur forming a new, viable plant.

If you are looking to identify Japanese knotweed, we have a range of resources as well as a dedicated identification service that can help; if you prefer, send us a picture for your free assessment.

If you think that you have Japanese Knotweed on your property or construction site, get in touch with our team of experts for your FREE consultation.

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